Aire-One
/
awesome
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Implement selection watcher objects 

These objects are created via e.g. selection_watcher("CLIPBOARD") to
track the CLIPBOARD selection. They start watching when their .active
property is set to true and stop when this property is unset again.

This commit implements the Lua side of that: A list of active watchers
is kept and updated when needed.

The next commit will add the X11-side of this so that these objects
actually do something.

Signed-off-by: Uli Schlachter <psychon@znc.in>
This commit is contained in:
Uli Schlachter 2019-02-06 10:10:52 +01:00
parent 0295df81c1
commit a24f35532c
1 changed files with 117 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

117
objects/selection_watcher.c
View File

@ -20,15 +20,132 @@
*/
#include "objects/selection_watcher.h"
#include "common/luaobject.h"
#include "globalconf.h"
#include <xcb/xfixes.h>
#define REGISTRY_WATCHER_TABLE_INDEX "awesome_selection_watchers"
typedef struct selection_watcher_t
{
LUA_OBJECT_HEADER
/** Is this watcher currently active and watching? Used as reference with luaL_ref */
int active_ref;
/** Atom identifying the selection to watch */
xcb_atom_t selection;
} selection_watcher_t;
static lua_class_t selection_watcher_class;
LUA_OBJECT_FUNCS(selection_watcher_class, selection_watcher_t, selection_watcher)
void
event_handle_xfixes_selection_notify(xcb_generic_event_t *ev)
{
}
/** Create a new selection watcher object.
* \param L The Lua VM state.
* \return The number of elements pushed on the stack.
*/
static int
luaA_selection_watcher_new(lua_State *L)
{
size_t name_length;
const char *name;
xcb_intern_atom_reply_t *reply;
selection_watcher_t *selection;
name = luaL_checklstring(L, 2, &name_length);
selection = (void *) selection_watcher_class.allocator(L);
selection->active_ref = LUA_NOREF;
/* Get the atom identifying the selection to watch */
reply = xcb_intern_atom_reply(globalconf.connection,
xcb_intern_atom_unchecked(globalconf.connection, false, name_length, name),
NULL);
if (reply) {
selection->selection = reply->atom;
p_delete(&reply);
}
return 1;
}
static int
luaA_selection_watcher_set_active(lua_State *L, selection_watcher_t *selection)
{
bool b = luaA_checkboolean(L, -1);
bool is_active = selection->active_ref != LUA_NOREF;
if(b != is_active)
{
if (b)
{
/* Selection becomes active */
/* Reference the selection watcher. For this, first get the tracking
* table out of the registry. */
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
/* Then actually get the reference */
lua_pushvalue(L, -3 - 1);
selection->active_ref = luaL_ref(L, -2);
/* And pop the tracking table again */
lua_pop(L, 1);
} else {
/* Unreference the selection object */
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
luaL_unref(L, -1, selection->active_ref);
lua_pop(L, 1);
selection->active_ref = LUA_NOREF;
}
luaA_object_emit_signal(L, -3, "property::active", 0);
}
return 0;
}
static int
luaA_selection_watcher_get_active(lua_State *L, selection_watcher_t *selection)
{
lua_pushboolean(L, selection->active_ref != LUA_NOREF);
return 1;
}
void
selection_watcher_class_setup(lua_State *L)
{
static const struct luaL_Reg selection_watcher_methods[] =
{
LUA_CLASS_METHODS(selection_watcher)
{ "__call", luaA_selection_watcher_new },
{ NULL, NULL }
};
static const struct luaL_Reg selection_watcher_meta[] = {
LUA_OBJECT_META(selection_watcher)
LUA_CLASS_META
{ NULL, NULL }
};
/* Reference a table in the registry that tracks active watchers. This code
* does debug.getregistry()[REGISTRY_WATCHER_TABLE_INDEX] = {}
*/
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
lua_newtable(L);
lua_rawset(L, LUA_REGISTRYINDEX);
luaA_class_setup(L, &selection_watcher_class, "selection_watcher", NULL,
(lua_class_allocator_t) selection_watcher_new, NULL, NULL,
luaA_class_index_miss_property, luaA_class_newindex_miss_property,
selection_watcher_methods, selection_watcher_meta);
luaA_class_add_property(&selection_watcher_class, "active",
(lua_class_propfunc_t) luaA_selection_watcher_set_active,
(lua_class_propfunc_t) luaA_selection_watcher_get_active,
(lua_class_propfunc_t) luaA_selection_watcher_set_active);
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80